The at-home TOEFL test now includes ID verification via a mobile app called IDVaaS (developed by Entrust). It looks like test takers receive an email following their test registration with instructions on how to do it.
As I understand it, test takers must install the app and carry out the verification procedure BEFORE their testing appointment. During this procedure they’ll take a picture of their passport, and then a picture of themselves, and finally press their phone against their passport to read the chip (if applicable). More instructions can be found here.
There have been a few early reports from test takers who say they didn’t get the email. If that has happened to you, leave a comment below.